WO2010023778A1 - Dispositif sans fil et dispositif de mesure équipé de ce dernier - Google Patents

Dispositif sans fil et dispositif de mesure équipé de ce dernier Download PDF

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Publication number
WO2010023778A1
WO2010023778A1 PCT/JP2009/000974 JP2009000974W WO2010023778A1 WO 2010023778 A1 WO2010023778 A1 WO 2010023778A1 JP 2009000974 W JP2009000974 W JP 2009000974W WO 2010023778 A1 WO2010023778 A1 WO 2010023778A1
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WO
WIPO (PCT)
Prior art keywords
ground plate
loop antenna
loop
wireless device
antenna
Prior art date
Application number
PCT/JP2009/000974
Other languages
English (en)
Japanese (ja)
Inventor
宮下功寛
Original Assignee
パナソニック株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by パナソニック株式会社 filed Critical パナソニック株式会社
Priority to JP2010526487A priority Critical patent/JP5304790B2/ja
Priority to EP09809437.8A priority patent/EP2302812B1/fr
Publication of WO2010023778A1 publication Critical patent/WO2010023778A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q9/00—Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D21/00—Measuring or testing not otherwise provided for
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
    • G01F15/06—Indicating or recording devices
    • G01F15/061—Indicating or recording devices for remote indication
    • G01F15/063—Indicating or recording devices for remote indication using electrical means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/225—Supports; Mounting means by structural association with other equipment or articles used in level-measurement devices, e.g. for level gauge measurement
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H04B1/0458—Arrangements for matching and coupling between power amplifier and antenna or between amplifying stages
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2209/00—Arrangements in telecontrol or telemetry systems
    • H04Q2209/40—Arrangements in telecontrol or telemetry systems using a wireless architecture

Definitions

  • the present invention relates to a wireless device and a measuring device that includes the wireless device and measures measured values such as water, gas, and electricity usage and transmits the measured values by wireless communication.
  • an automatic meter reading system includes a measuring device that measures the usage amount of water, gas, electricity, and the like, and a wireless device that transmits the usage amount measured by the measuring device by wireless communication, and collects the usage amount. . Since a wireless device is often placed in a place where a wall, a metal object such as a housing of a measuring device, and a pipe are close to each other, it is desired that the wireless device is small and hardly affected by metal.
  • Patent Documents 1 and 2 disclose a measuring device including a wireless device having an inverted F-type antenna having a low profile. In these measuring devices, since the influence of surroundings such as metal is avoided by limiting the installation location, it cannot be installed in an arbitrary location. Furthermore, since these inverted F antennas have a complicated structure, it is difficult to reduce the size of the wireless device. Japanese Patent Laid-Open No. 09-027092 Japanese Patent Application Laid-Open No. 11-086174
  • the wireless device includes a ground plate, a loop antenna provided on the surface of the ground plate, and a power feeding unit that feeds a signal corresponding to the measured value to the loop antenna.
  • This wireless device can be installed in any place and can be miniaturized.
  • FIG. 1 is a perspective view of a measuring apparatus according to an embodiment of the present invention.
  • FIG. 2 is a configuration diagram of a wireless device of the measuring device according to the embodiment.
  • FIG. 3 is a configuration diagram of a matching circuit of the wireless device according to the embodiment.
  • FIG. 4 shows antenna characteristics of the wireless device according to the embodiment.
  • FIG. 5 shows the characteristics of the antenna in the embodiment.
  • FIG. 6 shows the characteristics of the antenna in the embodiment.
  • FIG. 7 is a configuration diagram of the matching circuit of the comparative example.
  • FIG. 8 is a perspective view in the case of the wireless device according to the embodiment.
  • FIG. 9 is a perspective view in the case of another wireless device according to the embodiment.
  • FIG. 10 is a perspective view in a case of still another wireless device according to the embodiment.
  • FIG. 11 is a perspective view in a case of still another wireless device according to the embodiment.
  • FIG. 1 is a perspective view of a measuring apparatus 100 according to an embodiment of the present invention.
  • the measurement device 100 includes a measurement unit 100A and a wireless device 200.
  • the measurement unit 100A covers a measurement unit 120A that measures the value of the measurement amount, a connection unit 101 that connects the pipe 101A, a display unit 102 that displays the value measured by the measurement unit 120A, and a display unit 102 that can be opened and closed. And a lid 103.
  • the measurement unit 100A that is, the measurement unit 120A measures the value of the amount of fluid such as gas or water flowing through the pipe 101A as the amount to be measured.
  • the wireless device 200 is provided around the display unit 102, transmits the measured value to an external wireless terminal by wireless communication, and transmits / receives a wireless signal to / from the wireless terminal.
  • the wireless device 200 is installed on the installation surface 206 and has a case 200A.
  • the installation surface 206 is a part of the surface of the measurement unit 120A.
  • FIG. 2 is a configuration diagram of the wireless device 200.
  • an X axis, a Y axis, and a Z axis that are perpendicular to each other are defined.
  • the X axis is perpendicular to the installation surface 206.
  • the case 200 ⁇ / b> A of the wireless device 200 is not illustrated in order to describe the configuration of the wireless device 200.
  • the ground plate 201 is made of a conductor and has a front surface 201A and a back surface 201B opposite to the front surface 201A.
  • the communication circuit 202 is a transmission / reception circuit that is provided on the back surface 201B of the ground plate 201, outputs a transmission signal, and processes an input reception signal.
  • the communication circuit 202 may be a transmission circuit that outputs a transmission signal and does not receive a reception signal.
  • the communication circuit 202 may be a reception circuit to which a reception signal is input without outputting a transmission signal.
  • the matching circuit 203 is provided on the surface 201 A of the ground plate 201 and is connected to the loop antenna 204 and the communication circuit 202.
  • the communication circuit 202 has a power supply terminal 202 ⁇ / b> A connected to the matching circuit 203.
  • the communication circuit 202 generates a signal corresponding to the measured value.
  • the matching circuit 203 and the communication circuit 202 constitute a power feeding unit 301 that feeds the signal to the loop antenna 204.
  • the matching circuit 203 performs impedance matching between the loop antenna 204 and the communication circuit 202 in order to efficiently supply power to the antenna 204.
  • the loop antenna 204 is formed of a U-shaped conductor band 1204 having end portions 204A and 204B, and forms a rectangular loop shape together with the ground plate 201.
  • the ends 204A and 204B are joined to connection points 201C and 201D on the surface 201A of the ground plate 201, respectively.
  • An end portion 204A of the loop antenna 204 is electrically connected to the matching circuit 203 of the power feeding portion 301, and an end portion 204B is electrically connected to the ground plate 201.
  • the loop antenna 204 and the ground plate 201 form a loop antenna made of a conductor having a loop shape.
  • the total length of the loop antenna 204 is less than or equal to the wavelength of radio waves to be transmitted and received.
  • the loop antenna 204 is formed by bending a plate-shaped conductor band 1204. As described above, the loop plane 2204 including the rectangular loop shape of the loop antenna 204 is substantially perpendicular to the ground plate 201. The loop shape may not be rectangular.
  • the loop antenna 204 is provided at the end of the surface 201A of the ground plate 201 in the Z-axis direction.
  • the battery 205 is electrically connected to the communication circuit 202 and the ground plate 201 and supplies power to the communication circuit 202.
  • the installation surface 206 which is the surface of the measurement unit 120A, is made of a conductor.
  • FIG. 3 is a circuit diagram of the power feeding unit 301 including the matching circuit 203 and the communication circuit 202.
  • the matching circuit 293 includes a series capacitor C1 and a parallel capacitor C2.
  • the series capacitor C1 is connected to the power supply terminal 202A of the communication circuit 202 and the power supply end 301A, that is, the connection point 201C of the ground plate 201.
  • the parallel capacitor C2 is connected between the power supply terminal 202A and the ground terminal 301B, and is connected in parallel to the communication circuit 202. Since the loop antenna 204 has a small radiation resistance, the loss of the matching circuit 203 needs to be very small. Since the inductor has a larger loss than the capacitor, when used in a matching circuit, the radiation efficiency is degraded and the gain is greatly reduced.
  • the matching circuit 203 preferably includes a capacitor without including an inductor.
  • the frequency of the signal supplied from the power supply terminal 202A of the communication circuit 202 is 434 MHz
  • the real part Re (Z11) of the antenna input impedance Z11 is 1 ⁇
  • the imaginary part Im (Z11) is 180 ⁇ .
  • the capacitance of the series capacitor C1 is 2.12 pF
  • the capacitance of the parallel capacitor C2 is 51 pF.
  • the capacity of the series capacitor C1 is smaller than the capacity of the parallel capacitor C2.
  • the XY plane including the X axis and the Y axis is parallel to the ground.
  • a polarization in a direction parallel to the Z axis is a vertical polarization, and a polarization orthogonal to the vertical polarization is a horizontal polarization.
  • the power feeding unit 301 having the communication circuit 202 and the matching circuit 203 has a power feeding end 301A and a grounding end 301B.
  • the feeding end 301 ⁇ / b> A is connected to the end 204 ⁇ / b> A of the loop antenna 204.
  • the grounding end 301B of the power feeding unit 301 is connected from a connection point 201C on the surface 201A of the ground plate 201 to a connection point 201E located in a direction parallel to the Z axis.
  • the route R1 is a route through which the current I1 flows through the ground plate 201 via the loop antenna 204.
  • the current I1 generates a magnetic current M1 flowing in the loop shape formed by the loop antenna 204 and the ground plate 201 in the soup plane 2204 parallel to the XY plane and flowing perpendicularly to the XY plane in parallel with the Z axis. Radiate.
  • the loop antenna 204 operates as a magnetic current antenna using a magnetic current as a radiation source.
  • the path R2 is a path through which a current I2 flows in parallel to the Z axis from the connection point 201E of the ground plate 201 to the connection point 201C.
  • Vertically polarized waves are radiated by a current I2 flowing in the ground plate 201 in parallel with the Z-axis.
  • a portion 201F from the connection point 201E to the connection point 201C on the surface 201A of the ground plate 201 operates as a current antenna using a current as a radiation source.
  • a portion 201F of the surface 201A of the ground plate 201 extends in the Z-axis direction, that is, extends perpendicular to the XY plane and the loop plane 2204.
  • the gain of the magnetic current antenna is high when the direction of the magnetic current is parallel to the conductor surface, and low when the direction of the magnetic current is orthogonal to the conductor surface.
  • the gain of the current antenna is low when the direction of current is parallel to the conductor surface, and the gain is high when orthogonal to the conductor surface.
  • the loop antenna 204 When the installation surface 206 is located along the X-axis or Y-axis direction from the wireless device 200, the loop antenna 204 operates as a magnetic current antenna and thus has a high gain. Since the ground plate 201 operates as a current antenna, its gain is greatly reduced. Therefore, when the installation surface 206 approaches from the X-axis or Y-axis direction, the loop antenna 204 operates as a magnetic current antenna.
  • the loop antenna 204 When the installation surface 206 is located in the Z-axis direction from the wireless device 200, the loop antenna 204 operates as a magnetic current antenna, so that its gain is greatly reduced. Since the ground plate 201 operates as a current antenna, it has a high gain. Therefore, when the installation surface 206 is located in the Z-axis direction from the wireless device 200, the wireless device 200 operates as a current antenna. As described above, the antenna of the wireless device 200 has a high gain regardless of the direction in which the wireless device 200 is located from the installation surface 206 made of a conductor.
  • the loop shape diameter of the loop antenna 204 is smaller than the wavelength and is placed on the ground plate 201, so that the wireless device 200 is small and simple. It has a simple structure.
  • the measurement unit 120A may measure the value of electricity usage instead of the usage amount of gas or water, and the wireless device 200 may transmit the value. Further, the wireless device 200 does not need to be installed in the vicinity of the measurement unit 120A, and can be applied to, for example, a wireless repeater that relays wireless communication between the measurement unit 120A and an external wireless terminal.
  • FIG. 4 shows the relationship between the length L of the ground plate 201 in the Z-axis direction and the radiation efficiency of the antenna. As shown in FIG. 4, the radiation efficiency increases as the length L of the ground plate 201 increases.
  • FIG. 5 shows the relationship between the length L of the ground plate 201 and the real part Re (Z11) and the imaginary part Im (Z11) of the input impedance Z11 of the antenna.
  • the imaginary part Im (Z11) of the input impedance Z11 is inductive, and when the length L of the ground plate 201 is around 50 to 90 mm, the impedance Z11 is the lowest.
  • the length L of the ground plate 201 is preferably around 50 to 90 mm.
  • FIG. 6 shows the relationship between the distance D and the radiation efficiency of the loop antenna 204. Regardless of the width H in the Z-axis direction of the conductor band 1204 of the loop antenna 204, if the distance D between the loop antenna 204 and the battery 205 is 10 mm or less, the radiation efficiency is significantly reduced. That is, the distance D between the loop antenna 204 and the battery 205 is preferably 10 mm or more.
  • FIG. 7 is a circuit diagram of the power feeding unit 302 of the comparative example.
  • a power feeding unit 302 illustrated in FIG. 7 includes a matching circuit 303 instead of the matching circuit 203 of the power feeding unit 301 illustrated in FIG. 3.
  • the power feeding unit 302 has a power feeding end 302A and a grounding end 302B connected to the connection point 201C and the connection point 201E on the surface 201A of the ground plate 201, respectively.
  • the matching circuit 303 includes a series capacitor C11 and a parallel capacitor C12.
  • the series capacitor C11 is connected to the power supply terminal 202A of the communication circuit 202 and the power supply end 302A, that is, the connection point 201C of the ground plate 201.
  • the parallel capacitor C12 is connected between the power supply end 302A and the ground end 302B.
  • the matching circuit 303 shown in FIG. 7 is different from the matching circuit 203 shown in FIG. A matching circuit 203 when the frequency of the signal supplied from the power supply terminal 202A of the communication circuit 202 is 434 MHz, the real part Re (Z11) of the antenna input impedance Z11 is 1 ⁇ , and the imaginary part Im (Z11) is 180 ⁇ , The operation of 303 will be described.
  • the capacitance of the series capacitor C1 is 2.12 pF
  • the capacitance of the parallel capacitor C2 is 51 pF.
  • the capacitance of the series capacitor C11 is 0.29 pF
  • the capacitance of the parallel capacitor C12 is 1.75 pF
  • the capacitances of the capacitors C11 and C12 are smaller than those of the capacitors C1 and C2.
  • the matching circuit 203 shown in FIG. 3 can preferably use inexpensive capacitors as the capacitors C1 and C2.
  • FIG. 8 is a perspective view inside the case 200 ⁇ / b> A of the wireless device 200.
  • the loop antenna 204 is disposed on one end side on the ground plate 201.
  • the battery 205 is disposed outside the ground plate 201 and at a position facing the loop antenna 204.
  • the battery 205 is electrically connected from a connector provided on the ground plate 201 through a cable line.
  • the pole of the battery 205 and the cable wire are fixed by soldering.
  • the length of the ground plate 201 is 50 mm
  • the distance between the loop antenna 204 and the battery 205 is 52 mm
  • the height of the loop antenna 204 is 17 mm. With such a configuration, the antenna gain does not deteriorate.
  • FIG. 9 is a perspective view in the case 200A of another wireless device 1200 according to the embodiment.
  • the same reference numerals are given to the same parts as those of the radio apparatus 200 shown in FIG. 8, and the description thereof is omitted.
  • the loop antenna 204 is arranged on one end side on the ground plate 201.
  • the battery 205 is disposed outside the ground plate 201 at a position facing the loop antenna 204.
  • a reinforcing portion 802 is provided on the loop antenna 204.
  • the reinforcing portion 802 is provided with a convex surface in the extending direction of the loop antenna 204.
  • the length of the ground plate 201 is 50 mm
  • the distance between the loop antenna 204 and the battery 205 is 52 mm
  • the height of the loop antenna 204 is 17 mm.
  • the loop antenna 204 is formed by bending a plate-like conductor at a right angle so as to form a U-shape, and in order to obtain a certain communication characteristic, a certain dimension or more must be taken.
  • the antenna 204 may be deformed unintentionally.
  • the strength of the loop antenna 204 is increased.
  • the effect obtained by improving the strength of the loop antenna 204 is not limited to the manufacturing process.
  • the reinforcing portion 802 may be formed by making the surface of the loop antenna 204 concave.
  • FIG. 10 is a perspective view of the case 200A of still another wireless device 2200 according to the embodiment.
  • the same parts as those of the wireless device 1200 shown in FIG. 9 are denoted by the same reference numerals, and the description thereof is omitted.
  • the distance between the loop antenna 204 and the battery 205 is preferably 10 mm or more. As shown in FIG. 10, by disposing the battery 205 perpendicular to the loop plane of the loop antenna 204, the projected area of the battery 205 with respect to the loop plane is reduced, and the reduction in radiation efficiency can be mitigated.
  • FIG. 11 is a perspective view in the case 200A of still another wireless device 3200 according to the embodiment.
  • the same parts as those of the wireless device 2200 shown in FIG. 10 are denoted by the same reference numerals, and the description thereof is omitted.
  • a reinforcing portion 803 is provided on the loop antenna 204 together with the reinforcing portion 802.
  • the reinforcing portion 803 is formed by forming a bent portion of the loop antenna 204 in a concave shape, and increases the strength of the loop antenna 204.
  • the battery 205 is separated from the ground plate 201, but the battery 205 may be disposed on the ground plate 201.
  • the measuring device equipped with the wireless device according to the present invention can be installed in any place and can be miniaturized.
  • the wireless device is useful not only as a wireless device attached to a measuring device but also as a wireless repeater attached to a pipe or a wall.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Details Of Aerials (AREA)
  • Support Of Aerials (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Waveguide Aerials (AREA)
  • Transceivers (AREA)
  • Transmitters (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)

Abstract

Un dispositif sans fil est doté d'une plaque de mise à la masse, d'une antenne cadre disposée sur une surface de la plaque de mise à la masse et d'une section alimentation destinée à fournir à l'antenne cadre des signaux qui correspondent à une valeur mesurée. Le dispositif sans fil peut être disposé à un endroit discrétionnaire et peut présenter une taille réduite.
PCT/JP2009/000974 2008-09-01 2009-03-04 Dispositif sans fil et dispositif de mesure équipé de ce dernier WO2010023778A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2010526487A JP5304790B2 (ja) 2008-09-01 2009-03-04 無線装置とそれを備えた計測装置
EP09809437.8A EP2302812B1 (fr) 2008-09-01 2009-03-04 Dispositif sans fil et dispositif de mesure équipé de ce dernier

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2008223127 2008-09-01
JP2008-223127 2008-09-01

Publications (1)

Publication Number Publication Date
WO2010023778A1 true WO2010023778A1 (fr) 2010-03-04

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PCT/JP2009/000974 WO2010023778A1 (fr) 2008-09-01 2009-03-04 Dispositif sans fil et dispositif de mesure équipé de ce dernier

Country Status (4)

Country Link
EP (1) EP2302812B1 (fr)
JP (2) JP5304790B2 (fr)
CN (2) CN201397572Y (fr)
WO (1) WO2010023778A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2012070242A1 (ja) * 2010-11-25 2014-05-19 パナソニック株式会社 無線機
JP2018117182A (ja) * 2017-01-16 2018-07-26 日本無線株式会社 アンテナ装置及び無線通信装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010023778A1 (fr) * 2008-09-01 2010-03-04 パナソニック株式会社 Dispositif sans fil et dispositif de mesure équipé de ce dernier
WO2020049744A1 (fr) 2018-09-07 2020-03-12 Smc株式会社 Module d'antenne sans fil et système sans fil

Citations (4)

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JPS5853235A (ja) * 1981-09-25 1983-03-29 Nippon Telegr & Teleph Corp <Ntt> 最大エネルギ−受信方式
JPH0927092A (ja) 1995-07-13 1997-01-28 Matsushita Electric Ind Co Ltd 自動検針用無線装置
JPH1186174A (ja) 1997-09-03 1999-03-30 Tokyo Gas Co Ltd 自動検針用無線装置
JP2007325621A (ja) * 2006-06-06 2007-12-20 Matsushita Electric Ind Co Ltd 体外ユニット

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JPH0567910A (ja) * 1991-09-06 1993-03-19 Nippon Telegr & Teleph Corp <Ntt> 携帯可能な無線装置
JP4510244B2 (ja) * 2000-07-19 2010-07-21 パナソニック株式会社 アンテナ装置
JP4749561B2 (ja) * 2001-02-13 2011-08-17 三省電機株式会社 通信基地局用アンテナの構成方法、および同アンテナ装置
FI119667B (fi) * 2002-08-30 2009-01-30 Pulse Finland Oy Säädettävä tasoantenni
JP3930024B2 (ja) * 2004-02-17 2007-06-13 京セラ株式会社 タイヤ空気圧情報送信装置及びこれを用いたタイヤ空気圧情報送信装置付きホイール
JP2006074369A (ja) * 2004-09-01 2006-03-16 Pacific Ind Co Ltd タイヤ状態監視装置の送信機及び同送信機に用いられるアンテナ
US7242364B2 (en) * 2005-09-29 2007-07-10 Nokia Corporation Dual-resonant antenna
KR101058595B1 (ko) * 2006-08-03 2011-08-22 파나소닉 주식회사 안테나 장치
CN200996994Y (zh) * 2006-12-21 2007-12-26 中国电子科技集团公司第五十研究所 单天线无线电高度表
WO2010023778A1 (fr) * 2008-09-01 2010-03-04 パナソニック株式会社 Dispositif sans fil et dispositif de mesure équipé de ce dernier

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Publication number Priority date Publication date Assignee Title
JPS5853235A (ja) * 1981-09-25 1983-03-29 Nippon Telegr & Teleph Corp <Ntt> 最大エネルギ−受信方式
JPH0927092A (ja) 1995-07-13 1997-01-28 Matsushita Electric Ind Co Ltd 自動検針用無線装置
JPH1186174A (ja) 1997-09-03 1999-03-30 Tokyo Gas Co Ltd 自動検針用無線装置
JP2007325621A (ja) * 2006-06-06 2007-12-20 Matsushita Electric Ind Co Ltd 体外ユニット

Non-Patent Citations (1)

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Title
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2012070242A1 (ja) * 2010-11-25 2014-05-19 パナソニック株式会社 無線機
US9601831B2 (en) 2010-11-25 2017-03-21 Panasonic Intellectual Property Management Co., Ltd. Radio device
JP2018117182A (ja) * 2017-01-16 2018-07-26 日本無線株式会社 アンテナ装置及び無線通信装置

Also Published As

Publication number Publication date
EP2302812A4 (fr) 2012-08-01
CN101667329A (zh) 2010-03-10
EP2302812B1 (fr) 2017-05-03
JP5304790B2 (ja) 2013-10-02
CN101667329B (zh) 2013-01-16
JP2010081574A (ja) 2010-04-08
CN201397572Y (zh) 2010-02-03
JPWO2010023778A1 (ja) 2012-01-26
EP2302812A1 (fr) 2011-03-30

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